Measurement Analysis and Method for Reduction of Wall Eccentricity of Seamless Steel Tube
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摘要: 运用模型对无缝钢管壁厚偏心率的形成及构成进行分析；阐述了一种降低偏心率误差的方法——穿孔时偏心高频率旋转技术，并将该方法用于监测生产过程。分析认为：无缝钢管的偏心率由来自管坯方面的偏心率和来自穿孔顶头的偏心率构成；穿孔时采用偏心高频率旋转技术，降低了偏心率的产生振幅，使轧件沿周向产生金属流动，从而达到减小偏心率的目的。Abstract: Analyzed via relevant model are development and formation of wall eccentricity of the seamless steel tube. And also elaborated is a method for reducing error of such eccentricity，i.e.，the in-piercing process eccentric high frequency spinning technique. This method is used to monitor the manufacturing process. The analysis reveals that the said pipe eccentricity is originated by the bloom eccentricity and the piercer plug eccentricity. The superposition of these two factors lead to the local maximum value. Owing to using the said eccentric HF spinning technique during piercing operation，the vibration amplitude that causes the eccentricity is reduced to get circumferential metal flow of the workpiece so as to lessen the wall eccentricity of the pipe.
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Keywords:
- seamless steel tube /
- rotary piercing mill /
- wall thickness /
- eccentricity /
- bloom /
- plug /
- quality improvement /
- cost cut-down
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